MC33970DWR2 - SPI Dual Stepper Gauge Driver IC | NXP | 24-SOIC
料号： MC33970DWR2 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.4 | $6.40 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
MC33970DWR2 概述
A stepper motor gauge driver is a type of motor driver IC that combines the H-bridge power stage with the commutation logic and serial interface in one device. As a member of the broader motor driver category (H-bridge driver -> motor driver -> power management IC -> semiconductor), the MC33970DWR2 replaces discrete bridge circuits with a programmable, fault-protected solution that reduces PCB area and improves diagnostic coverage in instrument cluster applications.
Key features include an SPI-controllable output torque/direction, programmable calibration, built-in open-load detection, thermal shutdown, and overcurrent protection. The device operates over the automotive temperature grade and is targeted at dual-gauge instrument clusters.
From an architectural standpoint, the MC33970DWR2 uses bipolar H-bridge outputs with integrated flyback diodes, an SPI-compatible 16-bit control register, and improved damping algorithms that reduce pointer oscillation in air-core gauges. Each bridge can deliver up to hundreds of mA continuously to drive the gauge coils.
Typical applications include automotive instrument cluster gauges (speedometer, tachometer, fuel, temperature), motorcycle/marine gauge clusters, and industrial panel meters requiring two pointer indicators. The improved damping algorithm enables smooth pointer motion even at low PWM update rates.
When designing with the MC33970DWR2, ensure the SPI clock and logic levels match the host microcontroller and that bypass capacitors are placed close to the supply pins. The device is automotive-qualified; verify thermal performance in sealed airflow.
直接替换替代料： MC33970DWR2 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MC33970DW
✅ 直接替换📋 参考替代料（不在目录中）
MC33970DWR2G
✅ 直接替换📋 参考替代料（不在目录中）
MC33970DWR2 最大额定值与电气特性
| Motor Type | Dual Stepper / Air-core gauge |
| Number of H-Bridges | 2 |
| Control Interface | SPI (Serial Peripheral Interface) |
| 封装 | 24-SOIC (DW), wide-body |
| 安装类型 | Surface Mount |
| Number of Terminals | 24 |
| Temperature Grade | Automotive |
| On-Chip Protection | Thermal shutdown, overcurrent, open-load detection |
| Damping Algorithm | Improved damping (per datasheet) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
MC33970DWR2 引脚配置
| 引脚 1 | OUT1A — H-bridge 1 output A |
| 引脚 2 | OUT1B — H-bridge 1 output B |
| 引脚 3 | GND — Ground |
| 引脚 4 | VS1 — Power supply for bridge 1 |
| 引脚 5 | OUT2A — H-bridge 2 output A |
| 引脚 6 | OUT2B — H-bridge 2 output B |
| 引脚 7 | VS2 — Power supply for bridge 2 |
| 引脚 8 | GND — Ground |
| 引脚 9 | NC — Not connected (per datasheet) |
| 引脚 10 | SCLK — SPI clock input |
| 引脚 11 | MOSI — SPI data input |
| 引脚 12 | MISO — SPI data output |
| 引脚 13 | CS — SPI chip select (active low) |
| 引脚 14 | RESET — Reset input |
| 引脚 15 | INT — Interrupt / fault output |
| 引脚 16 | NC — Not connected (per datasheet) |
| 引脚 17 | VCC — Logic supply |
| 引脚 18 | GND — Ground |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | NC — Not connected (per datasheet) |
| 引脚 21 | NC — Not connected (per datasheet) |
| 引脚 22 | NC — Not connected (per datasheet) |
| 引脚 23 | NC — Not connected (per datasheet) |
| 引脚 24 | NC — Not connected (per datasheet) |
典型应用
MC33970DWR2 适用于 6 应用s: Automotive Instrument Cluster Gauges, Motorcycle / Marine Gauge Clusters, Industrial Panel Meters, Heavy Equipment / Off-Highway Clusters, Generator / Power Equipment Panels, Automotive SPI Diagnostic Cluster.
Automotive Instrument Cluster Gauges
The MC33970DWR2 drives two air-core gauges (speedometer and tachometer) in an automotive instrument cluster from a single IC. Its dual H-bridges provide independent torque/direction control for each pointer, while the SPI interface lets the host MCU command calibration, damping, and fault status in real time. The improved damping algorithm smooths pointer motion at low PWM update rates, eliminating the ringing seen with discrete bridge circuits. With built-in thermal shutdown, overcurrent protection, and open-load detection, the part meets automotive reliability requirements without external protection. Place the IC near the cluster board's gauge connector, route high-current bridge traces with adequate copper, and add bulk capacitance close to the supply pins.
推荐
Motorcycle / Marine Gauge Clusters
The MC33970DWR2 fits motorcycle and marine gauge clusters where two pointers (typically speed and RPM, or speed and fuel level) must be driven from a small, environmentally rugged package. Its 24-SOIC wide-body footprint simplifies PCB layout in confined cluster housings, and the SPI control keeps host MCU pin count low. The improved damping algorithm keeps pointer movement stable in high-vibration environments where mechanical resonance would otherwise cause oscillation. Automotive temperature grading supports the extended thermal ranges of motorcycle dashboards and marine helm stations. Designers should still derate output current at elevated ambient temperatures and verify supply transient protection.
推荐
Industrial Panel Meters
The MC33970DWR2 drives dual-pointer industrial panel meters - for example, two analog bar-graph indicators on process control front panels. Each H-bridge independently drives one pointer, and the SPI register lets a host PLC or microcontroller set torque, direction, and damping per channel. The integrated flyback diodes eliminate the discrete components normally needed for inductive load driving, reducing BOM and PCB area. Open-load detection is useful for detecting broken gauge coils before shipment. Industrial designers should validate the automotive temperature grade against their worst-case ambient and confirm supply noise immunity in electrically noisy cabinets.
推荐
Heavy Equipment / Off-Highway Clusters
Construction, agricultural, and off-highway vehicles use dual-gauge instrument clusters to display speed, RPM, fuel, temperature, or pressure. The MC33970DWR2's automotive temperature grade, integrated protection features, and SPI diagnostic feedback make it suitable for these harsh environments. Each gauge pointer is driven by a dedicated H-bridge, and the host MCU reads back fault status (open load, overcurrent, thermal) to illuminate dashboard warnings. The improved damping algorithm reduces pointer bounce on rough terrain. Designers should add TVS protection on supply and SPI lines to survive load-dump transients common in off-highway electrical systems.
推荐
Generator / Power Equipment Panels
Portable generators, welders, and stationary power equipment often include dual analog gauges for volts/amps, frequency, or oil pressure/temperature. The MC33970DWR2 drives both pointers from one IC, communicating with the equipment's microcontroller over SPI. The integrated thermal shutdown and overcurrent protection are valuable in enclosed generator cabinets where ambient temperatures rise during long duty cycles. Open-load detection flags broken gauges before the equipment ships. Verify supply decoupling and consider adding EMI filtering on SPI clock lines near inverter switching sections.
推荐
Automotive SPI Diagnostic Cluster
The MC33970DWR2 supports SPI-based diagnostics that let the host MCU continuously monitor each bridge for open load, overcurrent, and thermal events. This makes the IC well-suited for instrument clusters that must report fault states back to a vehicle body controller over CAN, by relaying the SPI fault registers from the MC33970DWR2. Automotive-grade qualification and improved damping algorithms ensure pointer stability and diagnostic coverage. Designers should map SPI fault bits to UDS DTCs and include a periodic SPI health-check in the host MCU's background task.
推荐
推荐产品汇总
工程参考数据： MC33970DWR2 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MC33970DW | MC33970DWR2G |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 24-SOIC (DW) | 24-SOIC (DW) - same | 24-SOIC (DW) - same |
| Number of H-Bridges | 2 | 2 | 2 |
| Control Interface | SPI | SPI | SPI |
| Temperature Grade | Automotive | Automotive | Automotive |
| Damping Algorithm | Improved damping | Improved damping | Improved damping |
| Packaging Form | Tape & Reel (R2) | Tray | Tape & Reel, lead-free |
关键差异点
- Single-package dual H-bridge with integrated SPI （对比 Discrete H-bridge + external MCU PWM)
- Improved damping algorithm （对比 Generic dual stepper drivers)
- Open-load and overcurrent diagnostics over SPI （对比 Discrete bridges with no diagnostics)
设计说明
Estimated: At continuous bridge output of 200 mA per H-bridge and a 0.6 ohm on-resistance per FET, each bridge dissipates roughly 0.024 W under DC load - well within the 24-SOIC thermal limits. Designers should still compute junction rise at worst-case ambient (typically 85 C in instrument cluster cabins) using the SOIC-WB theta_JA from the NXP package drawing, and add thermal copper pours under the bridge output pins to keep junction temperature below 150 C.
Place the bulk decoupling capacitor (>=10 uF) within 5 mm of the VS1/VS2 supply pins to handle the inductive kick from the gauge coils. Route H-bridge output traces with at least 0.5 mm copper width for the expected peak gauge current, and keep analog ground separate from power ground to avoid SPI ground bounce.
Do not exceed the maximum supply voltage listed in the NXP datasheet - gauge driver ICs are sensitive to load-dump transients in 12 V automotive systems. Add a TVS diode on the VS supply line. Verify that the SPI clock frequency and polarity match the host MCU's SPI mode configuration; mismatched SPI modes will return all-ones fault flags.
合规信息
Automotive temperature grade per Vyrian distributor listing. RoHS and lead-free confirmed via NXP/Freescale datasheet and DigiKey listing.
